I am trying to simulate a Bragg Fiber Grating in 2D (for now). I am using Wave Optics Module in comsol. My fiber for testing, has 20 periods. I am using ELECTROMAGNETIC WAVES, FREQUENCY DOMAIN (EWFD), adding a Scattering Boundary Condition where the wave will enter with a Wave given by E field X = 0, Y = 0 and Z = 1V/m. Other Scattering Boundary Condition was added where I want to read the wave that is transmitted. Also was added as Perfect Magnetic Conductor the Top and Bottom Exterior Boundaries.
In the Study, I add only the step 1: Frequency Domain with the range of frequency like range(0.5*f0,deltaf,1.5*f0), Where deltaf is 1THz and f0 is equal to c_const/1.45[um].
When I try to se the results using the formula: intop2(ewfd.nPoav)/intop1(0.5*E0^2/Z0_const*n0)
I got a weird graph.
What am I missing?
Have you tried using a rectangular mode? Sometimes is easier to use these modes to see what is wrong with your model excitation. I'm also assuming you have the correct values for the periodic refractive index of the Bragg fiber.
Can you please tell what is this expression? intop2(ewfd.nPoav)/intop1(0.5*E0^2/Z0_const*n0)
Felipe Beltran-Mejia How can I try a rectangular mode? I calculate the period using refractive index for a simple fiber (1.4457 and 1.4378) and period of 556 [nm].
The expression intop2(ewfd.nPoav)/intop1(0.5*E0^2/Z0_const*n0) is to calculate transmission, where intop1 I am integrating in the same boundary as the incident field, and intop2 where the the trasmission wave "is getting out".
In your ports, change the type of port from Numeric to Rectangular. Let me know if this works.
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